What is the difference between A and CNAME records?

An A record maps a hostname directly to an IPv4 address. A CNAME aliases one hostname to another. Use A records for root domains; CNAME works for subdomains pointing elsewhere.

How long does DNS propagation take?

Typically minutes to a few hours with low TTL values, but up to 48 hours globally when caches hold older records. Lower TTL before planned changes to speed up the transition.

DNSSEC adds cryptographic signatures to DNS responses, preventing cache poisoning and spoofing attacks. Enable it through your DNS provider for an extra layer of domain security.

DNS Configuration & Infrastructure Guides

DNS is the phone book of the internet - when it breaks, your website, email, and APIs all fail even if your servers are healthy. Understanding record types and propagation is essential for every site owner.

These guides explain A, CNAME, MX, and TXT records, nameserver provider comparisons, DNSSEC, reverse DNS, and troubleshooting propagation delays. Written for developers and non-technical administrators alike.

Diagnose DNS issues instantly with RollDomains lookup, propagation, and nameserver checker tools.

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